Fine Gold Recovery from the Quicksand Concentrator. Home Quicksand Fluid Bed Concentrator for gold material, black sand, dredge concentrates, bank run or just old material that might have gold. Quicksand Gold Chamber runs 1 2 or smaller material fast and keeps the micron gold.Fluid bed gold ore concentrator (Take 1) A fun cheap DIY gold recovery tool. For those who are not familiar with fluid beds, this is not a primary concentrator like a sluice box. It is intended to further process the heavy material from a sluice or similar equipment to make the final cleanup easier.Mini DIY Gold Fluid Bed Box.